DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 5-6/2012 str. 51 <-- 51 --> PDF |
was slightly lower than the control in Halophila ovalis exposed to crude oil. The stability of the ratio Fv/Fm indicates preserved efficiency of photosystem II in clones ´Bora´ and ´Pannonia´. Furthermore, these clones were characterized by high photosynthetic activity. Changes in the chlorophylls and carotenoids content in poplars treated with crude oil were clone specific (Table 4.). Chlorophyll a, chlorophyll b and total chlorophylls were not considerably affected by treatments in clones ´Bora´ and ´Pannonia´ in most cases, while in clone ´9111/93´ values were considerably decreased, what can be correlated with growth decrease. However, the total carotenoids content was not affected in poplars by treatments. Reduction in chlorophyll content has been an indicator of environmental contamination (Agrawal, 1992) indicating enhanced chlorophyll degradation. That may explain the lower levels of chlorophyll |